porteuse utile

English translation: payload/useful carrier

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Explanation:The search term "payload-carrier-frequency" got 4 Googlies, all of them apparently relevant. The problem is that I had to add "frequency" as a kicker to get rid of the huge number of irrelevant (largely space-related) hits; so I think some charity is called for. Anyway, it's a plausible term, and would be understood as meaning what it's supposed to mean, even if it were not a term used in the field.

AM: Thank you for pointing out that "useful carrier" doesn't appear on my second link above. I have noticed this before with those Wiley links: things show up in Google that don't appear on the page if you look at it, because you need to subscribe to see the whole article.

Here's what appeared on Google:
"troduce a phase error in the useful carrier termed the AM–PM. conversion, i.e., changes in amplitude of both the useful carrier and ...".

Explanation:Little enough corroboration from Google et al., but I think the literal version may work here.

Note also the posibility of 'wanted' — we often talk about the ratio of noise to 'wanted signal', for example; without knowing a lot more of your context, it's difficult to be sure, but I"ve a feeling this is what they are talking about here: the 6.5 MHz pilot freq. is at the same level as the wanted carrier

RB: Yes, one of the problems is sifting through the 'noise' on Google, not least because 'useful' is often found in collocation with 'carrier', and often fortuitously; a lot of hits, for example, are actually 'useful carrier power' etc.

Explanation:The search term "payload-carrier-frequency" got 4 Googlies, all of them apparently relevant. The problem is that I had to add "frequency" as a kicker to get rid of the huge number of irrelevant (largely space-related) hits; so I think some charity is called for. Anyway, it's a plausible term, and would be understood as meaning what it's supposed to mean, even if it were not a term used in the field.

AM: Thank you for pointing out that "useful carrier" doesn't appear on my second link above. I have noticed this before with those Wiley links: things show up in Google that don't appear on the page if you look at it, because you need to subscribe to see the whole article.

Here's what appeared on Google:
"troduce a phase error in the useful carrier termed the AM–PM. conversion, i.e., changes in amplitude of both the useful carrier and ...".